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I am looking into buy a 2015 Dodge 2500hd 6.7 des. was wandering what the mpg. would be. when towing.if anyone out there has one.I know my gmc 2500 with. a vortex 6.2 it pulls good but only gets 6-7mpg when pulling my 34ft 5eri . I think i would have a hard time pulling the mountains out west...